Combined typewriter and calculator



P 1, 1964 K. HEISE 3,146,941

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PLUS 2.5% SALES .TAX 54.50

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INVENTOR: KURT H5155 AGENT Se t. 1, 1964 K. HEISE COMBINED TYPEWRITER AND CALCULATOR l9 Sheets-Sheet 2 Filed March 16, 1959 Sept. 1, 1964 K. HEISE COMBINED TYPEWRITER AND CALCULATOR 19 Sheets-Sheet 3 Filed March 16, 1959 VIIIIIIIIIIIII Illllllll /8Z P 1, 1964 K. HEISE 3,146,941

COMBINED TYPEWRITER AND CALCULATOR Filed March 16, 1959 19 Sheets-Sheet 4 P 1, 1964 K. HEISE COMBINED TYPEWRITER AND CALCULATOR 19 Sheets-Sheet 5 Filed March 16, 1959 QNN m- 1, 1964 K. HEISE 3,146,941

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COMBINED TYPEWRITEIR AND CALCULATOR Filed March 16, 1959 19 Sheets-Sheet 8 EEJEIEIEHSEEI Sept. 1, 1964 v K; HElSE 3,146,941

COMBINED TYPEWRITER AND CALCULATOR Filed March .16, 1959 l9 Sheets-Sheet 9 Sept. 1, K.- HEISE COMBINED TYPEWRITER AND CALCULATOR Filed March 16, 1959 19 Sheets-Sheet 1o Sept. 1 1964 K. HEISE 3,146,941

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COMBINED TYPEWRITER AND CALCULATOR Filed March 16,1959

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' COMBINED TYPEWRITER AND CALCULATOR Filed March 16, 1959 19 Sheets-Sheet 17 Se t. 1,' 1964 K.. HEISE COMBINED TYPEWRITER AND CALCULATOR S S C E S E Sept. 1, 1964 K. HEISE 3,146,941

COMBINED TYPEWRITER AND CALCULATOR Filed March 16, 1959 V 19 Sheets-Sheet 19 K a s N v (D Z T E] uk 5% D: J I :3 Q Q O LO Q Q (D N 1 2 m United States Patent 3,146,941 COMBINED TYPEWRITER AND CALCULATOR Kurt Heise, Hamburg-Billstedt, Germany, assignor to SCM Corporation, a corporation of New York Filed Mar. 16, 1959, Ser. No. 799,715 6 Claims. (Cl. 23560.12)

The invention relates to a combined typewriter and calculator whereby values are entered into the calculator as respective factors during the typing of the price and number of items on an invoice. A calculation is then initiated and the product of the two factors is automatically typed out under the control of a read-out mechanism. More specifically, the invention concerns means foraligning the decimal point of a value in the product register with a decimal point in the read-out mechanism.

Combined typewriters and calculators are known in which the read-out mechanism is permanently associated with a given number of orders of the result register and therefore the typing of the result with a decimal point located in a fixed position presents no particular problem. This arrangement, however, requires that the number of decimal places in each of the two factors of a calculation also be fixed. Thus, the arrangement becomes flexible with the result that the machine usually must be reprogrammed every time there is a change in the number of decimal places in either one of the factors or the result.

One alternative is to program the machine with a number of decimal places in each factor receiving mechanism which will take care of all probable decimal factors which may be entered. This arrangement, however, has two disadvantages, viz., (l) the greater the number of decimal places in the two factors, the greater the number of decimal places in the result register, thus effectively reducing the number of integral digits that may be printed, and (2) in those cases where the selected factor has a lesser number of decimal places than are provided in the factor receiving mechanism, zeros must be pumped in to complete the factor entry.

An object of the invention is to provide an improved combined typewriter and calculator.

Another object is to shift a register relative to a decimal point read-out mechanism.

Another object is to align a decimal point in a result register with the decimal point in a read-out mechanism.

A further object is to predetermine a tabulated position of decimal alignment of a register with a read-out mechanism, such tabulated position being controlled by a number of fractional digits in the factors of a calculation.

A still further object is to perform a progressive multiplication operation such as A X B X C and to properly located the decimal point of the final product ABC relative to the decimal point of the read-out mechanism.

According to the invention, two factors, which may be expressed as decimal values, are entered in a calculator simultaneously with the typing of the values on an invoice or other form. A decimal memory device counts the number of decimal digits that are contained in the two factors and accordingly determines the number of fractional digits that will be generated in the product of the two factors. At the end of the calculation the result register is shifted to a position in which the decimal point in the result register is aligned with a decimal point in the readout device, regardless of how many fractional digits are in the product.

The decimal point in the read-out device may be set for reading out any selected number of decimal digits. When figuringin terms of United States currency, for example, one practice is to set the decimal point for reading dollars and cents, i.e., with two decimal orders. Thus, it is 3,146,941 Patented Sept. 1., 1964 assumed that the result always will be expressed in dollars and cents; however, in some cases the value of an item may be expressed in terms of mills, and/ or the number of items may be expressed in terms of one or more fractional digits. In either case, the total price for each item will be expressed in fractions of cents, but since the charges are not broken down to less than cents, the fractional digits are dropped or, some cases, rounded ofi to the nearest cent when the charges are printed on the invoice.

Assume now that the price per unit is expressed in mills as well as dollars and cents, for example, $1.375, and that the number of units is a fractional amount such as 62.5. Tn this case there is one extra fractional digit in each the price and the units, or a total of four fractional digits in the product. A machine according to the invention accounts for the extra fractional digits in the following manner.

A conditioning mechanism is provided on the typewriter carriage which is rendered operative by the typing of, fractional digits to actuate a relay stepping mechanism once for each fractional digit that is entered. The stepping mechanism, in turn, controls. a tabulator mechanism which determines the return shift of the calculator carriage. Since two fractional digits are considered normal for the present problem, the stepping mechanism is operated only when a total of two decimal digits have been entered in the two factors. For each decimal digit in excess of two, the tabulator mechanism is operated to cause tabulation of the carriage one order to the right of its initial letftmost position.

In the foregoing example of $1.375 x 62.5 $5.9375, there are two decimal digits in excess of the normal two digits and therefore the carriage must be tabulated to a position which is two orders to the right of its initial position. This properly aligns the decimal point of the result in the register with the decimal point of the readout mechanism.

In the embodiment shown, the register carriage is automatically returned to its position of decimal alignment with the read-out mechanism after a multiplying operation so that the machine is in proper condition to type out the result upon command.

In order that the invention may be practiced by others, it will be described in terms of an express embodiment, given by way of example only, and with reference to the accompanying drawings in which:

FIG. 1 shows the typewriter keyboard;

FIG. 2 shows a sample invoice;

FIG. 3 shows a left-hand view of the typewriter-controlled magnets, the escaping pin carriage, the rising pin carriage, the value racks, and other mechanisms;

FIGS. 4, 5, and 6 show a left-side view of mechanisms actuated by the main operator shaft;

FIGS. 7 and 11 show a top view of the pin carriage escape mechanism;

FIG. 8 shows a left-side view of the multiplicand entry mechanism;

FIG. 9 shows a left-side view of the multiplier storage mechanism;

FIG. 10 shows a partial left-side View of the restoring mechanism;

FIG. 12 shows a top view of the escaping pin carriage;

FIG. 13 shows a section through the mnltiplicand mechanism and the product read-out mechanism;

FIG. 14 shows a left-side view of the multiplier entry mechanism;

FIGS. l5, l6, and 17 show the pin carriage controls from front, above, and left;

FIG. 18 shows certain controls of the rising pin carriage;

FIG. 19 shows the product scanner mechanism from the left; 

1. A COMBINED CALCULATOR AND TYPEWRITER COMPRISING A PLURAL ORDER NUMERAL WHEEL REGISTER FOR RECORDING THE RESULT OF A CALCULATION, NUMERAL WHEEL ACTUATING MECHANISM, AND A VALVE ENTRY MECHANISM OPERABLE BY THE TYPEWRITER KEYS FOR CONTROLLING THE ACTUATING MECHANISM, A CARRIAGE ON THE TYPEWRITER, MEANS FOR READING OUT THE VALUE STANDING IN SAID REGISTER, MECHANISM FOR ORDINALLY SHIFTING THE REGISTER AND THE READ-OUT MEANS RELATIVE TO EACH OTHER, MEANS OPERABLE PRIOR TO A READ-OUT OPERATION AND UNDER CONTROL OF THE VALUE ENTRY MECHANISM FOR DETERMINING THE NUMBER OF ORDERS OF OPERATION OF THE SHIFTING MECHANISM, AND MEANS CARRIED BY THE TYPEWRITER CARRIAGE AND OPERABLE IN PREDETERMINED POSITIONS OF THE CARRIAGE TO CONDITION THE STEPPING MECHANISM FOR OPERATION BY THE VALUE ENTRY MECHANISM. 